On 2011-09-20, Grant Edwards <[email protected]> wrote: > I'm running a 2.6.30 kernel on an Atmel AT91SAM9g20 with uClibc > 0.9.30.3 built with gcc 4.4.6. > > The problem is that when calling nanosleep with small delays, the > calling task doesn't wake up until the next 4ms tick. > > Here are what I _think_ are the relevent portions of kernel config: > > CONFIG_TICK_ONESHOT=y > CONFIG_NO_HZ=y > CONFIG_HIGH_RES_TIMERS=y > CONFIG_GENERIC_CLOCKEVENTS_BUILD=y > CONFIG_VMSPLIT_3G=y > # CONFIG_VMSPLIT_2G is not set > # CONFIG_VMSPLIT_1G is not set > CONFIG_PAGE_OFFSET=0xC0000000 > CONFIG_PREEMPT=y > CONFIG_HZ=250 > CONFIG_AEABI=y > CONFIG_OABI_COMPAT=y
[...] > What I'm trying to figure out is what piece is missing... After some more googling and experimentation, I figured out that on Atmel AT91 targets you have to enable ATMEL_TCLIB in the kernel build in order to get high-res timers. [It would be nice if that were mentioned in the help text for ATMEL_TCLIB, but it isn't.] -- Grant _______________________________________________ uClibc mailing list [email protected] http://lists.busybox.net/mailman/listinfo/uclibc
